NCERT Solutions
Class 10 - Mathematics - Chapter 14: PROBABILITY - Exercise 14.1
Question 7

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Question. 7

It is given that in a group of 3 students, the probability of 2 students not having the same birthday is 0.992. What is the probability that the 2 students have the same birthday?

Answer:

The probability that the 2 students have the same birthday is 0.008.

Detailed Answer with Explanation:

The two events “having the same birthday” and “not having the same birthday” are complementary, so their probabilities add to 1. Hence P(same birthday) = 1 − 0.992 = 0.008.